﻿//
//  Copyright (c) 2008, Rafael Bandeira
//  All rights reserved.
//
//  Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
//
//  * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
//
//  * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other 
//  materials provided with the distribution.
//
//  * Neither the name of Rafael Bandeira nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior 
//  written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
//  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
//  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
//  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 
//  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using Paulovich.Data;

namespace Google.Web.Modulos
{
    public class Item<T> : System.Web.UI.Page
        where T : Persist, new()
    {
        protected bool EstaEditando(string chave)
        {
            int id;

            return TentarEditar(chave, out id);

        }

        protected bool TentarEditar(string chave, out int codigo)
        {

            return int.TryParse(Request[chave], out codigo) && codigo > 0;
        }

        protected T Carregar()
        {
            //
            // Declara o id
            //
            int id;
            
            //
            // Verifica se o ID passado por querystring pode ser convertido em inteiro
            // se puder, já o retorna no out na variável ID
            //
            if (TentarEditar("id", out id))
            {
                //
                // Instancia o generics
                //
                T obj = new T();

                //
                // Seta a PK da entidade com o id informado
                //
                obj.PrimaryKeys = new object[] { id };
                
                //
                // Carrega as propriedades do objeto
                //
                if (!obj.Get())
                {
                    throw new Exception("Não foi possível carregar o objeto do banco de dados.");
                }

                //
                // Retorna o objeto
                //
                return obj;
            }
            else
            {
                //
                // Retorna o generics
                //
                return new T();
            }
        }
    }
}
